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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec62170fa626bb226ed771d4261f2012c0ae8206503581c220db617e5c5ca851' 
  AND token = 'vJm8S7THxFigncURbnRXkL05ImE+v60LJLMDfEYRifw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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