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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989a2591f1399f6e39f035a449ecf6784b45a9d9f54da9cee98080f744a1c5a3' 
  AND token = 'GpZy8/V3WkmHcTm8lVn1lc2ed0T6Ds3sDpKeQT2Mbhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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