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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb69814ddbb59f4b3ab3f0cc8722bc6d009ebbd0036d08b566690c7aa8e14d1' 
  AND token = 'YzikX718xzIObRIoOrp/NxKN6Fk8L/F5pJy/mmI2ubc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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