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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066e2ad4345facf88d024528d8d44495d3c69b2e7bdaa27979f7c96ebbc9955b' 
  AND token = '2zQi28jWIhO3bJpDQ21zySgPhSOLb2Gu/FpgfP3gRfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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