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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd4c8bfbd86448f89785f610eabee71d3ad83d5a923239062ac94e8d9727ac3' 
  AND token = 'cDg528JJjTONhk8Kxp0FQzkQd5hWN2XpglRsxfjug7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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