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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce79fc3fdabae30c45bc6640cbae0b5d05c5c6f51e9fe7fcf84e0b5e8e59e06' 
  AND token = 'KZ9DCu/8sgoZtcN3QmhLtQC3TmndjC2KZI9gFs+ISW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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