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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7dd45b093cd32fcc5b0af3509103fd381eb2fe85418e6aecf79b24f23230c5' 
  AND token = 'QXVZfD0AsqH6wSqcqAXtr66Y9BVeNjSv5GapIj8r0P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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