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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6edaa8254817440e3121ca91465ce7a79d68f850953eeab2043d084f6c4405c6' 
  AND token = 'taMQ7nl4Tk1EzyzPifKTtXEi2pJbbk/1/qLJNV+pg4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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