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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918299a8863bd6526e4221423e50e615668306adcd28db286c46678357487fab' 
  AND token = 'AjbLd2YUZoqNsgZbs9Ph5NQAgTUhUJ+d72z8Dr+LmxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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