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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7d4e4fea051c062cb89e8771c0cd30422116f8fd6e03bd567c35fbc7016024' 
  AND token = 'FLYH9ld09eQ3/AsVXQTzrzEysOoXkrCKHIEdS2zqu5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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