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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00db607c0c07fb44978744c5e0414069fbd01641905c8e3466585fb338f252b' 
  AND token = 'zKj2rjjxypgxnnDJJ5xks6Xs98gyA0x/A5Bfo956wq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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