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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3512f9626b6292a486f30fd6e4c614a90fded1a2bb1604a89b64f5608f2571f7' 
  AND token = '0F+65vQlbl3DTgTOyC0FSXicXtFesWKsyjEH5K758Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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