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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc775b87b68c788d1a0cb5f9a3e1d6908259b4f94be435cb9eec0a7debcbe453' 
  AND token = '0rNb7CSgn2/4kgtVGcFh7QIc5oqw57ZwkaNxg1EvEyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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