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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfe9b97f9fe847b2a496fb55768fc1efd560944b516d352891f60c9585301e6' 
  AND token = 'rJAXXkPsogVq5SjDehvi/pHhd3a9REeeb9jXNqPXdos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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