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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235448c1e95d8c537bbb9e6e630a1de99c55ae090ff73b8b2053ba74b0c13d41' 
  AND token = '0vJih7AG0+6eW8Xuevx73qJYchMr5jikImMBvWyQYz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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