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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82c8ab32794403145ecf32e206a2d3b4237417d1ec5d98d150c90e88b73bb65' 
  AND token = 'dSsBArYqt3xSrw6kkH9X4lhFIeXrek486shYz6csgCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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