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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25fee0d5f6901198198173f30e66dbc1a9d17c7bae85acd71d7eed198e1e302' 
  AND token = 'thuNvWx3WKXuEaNEbuNgg7f5kA43fvpLhRUQsHn50OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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