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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb1d47248b4fcf9466a92a5f1dab860b906f07a1da6834742f1d1a8791f07b5' 
  AND token = 'vqVO4w1ScDrZQ8XnnLQaD13OBSokHIS8KFKz6RbE93s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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