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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa816ff11e64e9e101b656ad26296e85f787fb6f8766ffd912ba20354ede03d4' 
  AND token = '1UwU3Z1EXqkOpLZguw/TORhzMj78QOCAugEDT4maOGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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