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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f952957ff8f0dbff04a27c2c6e39a746342e11de980ae0a7d3b4ad19ba65df' 
  AND token = 'IDauQOzjFqYzy/Xnr5T0yePL6No8y1V9XqewaopKCgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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