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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2e7b1c34f5e07ba59f514666137ead08960031947ffc471a1ee354d2eb4402' 
  AND token = 'PpjzAq1uJZS1H54Z+3oc5g4K8QjPX912ZPb7WEZ5zKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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