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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab31bccc7daf3ea44cb8b39cad6ad74a7a94c815e4e629cd5df68df51f02e8b' 
  AND token = 'QiFHJTEd7Lj3Y8giuTd+ohF6i9Je7gLJX6EFgOJRowA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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