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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742d30e765f377e5fae6ca0cc81855d5e0635e6162f7d9b826c6683324f3b34e' 
  AND token = 'yyK5APKcp7AWT6V05uyDsfpPSJkrK8phteGAUJ145TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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