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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999bd36df5f8aca90e4c6e4b392c12a2aa54edbe93d45ece080dbe7fa49a1e2c' 
  AND token = 'by8CI6ANoQemcptyu1kzLHCpUkiDYD0u6nbe+vBSdAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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