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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2bfb0fedb07c3eced94c93ef3791d18a08b524f5fc5b7d0c8d83f81f336738' 
  AND token = 'qEjcctsfu9d3PajT2XQTO8oNlpAaljZaGXxCiO4WGRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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