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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a988ae90627f9d6591d08167a4fd9d26de5e5220751adc5815ddbea7ff55ea47' 
  AND token = 'VNBq8gYeSaypSdBgUkTSi4TlcNf2KN7+qcJKb5zJs4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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