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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324106cbfbe8f13ccf8255305229dafa28e3a5503c99043c1a98fb33c302ea19' 
  AND token = 'e9tZ8iD9DD6rF8eQMSG+T5esb97fUqKLoh3/MhBzu6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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