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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de647e49f047e78efc142459ca0d0154ae0b9266db17dc2f37168d2c237e2c2' 
  AND token = '2mOJ36qqB5G06900ZY5RWcd1v9PcO+pMmBhI3IhipxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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