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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5b40754af672e5405591e22f5ca03ab62e66084b1b549fd76825f73671c0c3' 
  AND token = 'wjLUkgw0Dtp2CBaOdMx/tmjv0vByWgzvkwnj60+MH0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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