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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473e7480172ab52258069b7af1148b29e579db579c3eaf8852298e78d6b39008' 
  AND token = 'FIKEXJY0ZUp9orjB8Gy9EMlBmGBqOOP5EkEMIDNN+Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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