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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0412bc8d617c1406c4d357c41beeccac6cb082523c66f214a04206b413b11c' 
  AND token = 'ddLyc1iV4qpsILpcOg9U4ZE7jx+wSSSly/H7IwOHerw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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