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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96ada214be4ae0b1b19d5d643089cd697ed9eb0690b7c9135b742a77691eff0' 
  AND token = '71ry+w3I5HH3Ka96kF4RVD3xS1rLboG6fNCkWcUOw+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}