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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4b990ee798efbd08b316cef81d5a5ddeb54d17734b18e5c63e84bb62edfcb6' 
  AND token = 'S/HihlR4O6gMl2Gz/7pMkiYG3W7CuFA6LN6JOFHmSRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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