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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07545c9ff1c4c8eeddbbd2eb8d1f3b06bf389a23769426eed7bf6ac745e7187' 
  AND token = 'DG+DHT6zVpnQsp2B5n4Cu8QxSO955767Bhv3kdyGJ0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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