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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e3b263fe8633b5585ea75863664089143d538609f5da2716e422982affa481' 
  AND token = 'H5FusSLg9OLPfBhD7N1UrfY6LDrmUE1yByaSMCC/5Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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