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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672a81b2bcce1a28765cb04a734c14003c752386e9a4d42d9ffae3c75c9327e4' 
  AND token = 'oh0gfsIFVUncSXkV7M5nM1x9UteUdtsS4mt9TMA8vI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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