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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6e81af20d0b787cc15a7c5ee62e77d088ab53d183bbda4db85c8a6f46ccdbc' 
  AND token = 'PLQS6e+TplkErux6341rY93MJuitqJj9DO5qT0OXMMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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