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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b8d21a636ad1566e7e70f3f101a3e594cce0ae459166ef32f1afd495b9563a' 
  AND token = 'RNp+6MtPm+qPTIuwkha6LSP4nr7TTDn3jJKYDO5LouI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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