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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911764b0ed9892a6f42ff412b2e5900dbf83c10643fba6c12cab21ac34c4d105' 
  AND token = 'YEy3xKbWTmPvKPB34N7oVkaX+iTo4CJmYp9tjz5SQIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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