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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce7ca5396732ec9e2dbab2725674e633c5525fe87f9feb677d20970d101d1d3' 
  AND token = 'N5cNGa7tT/yx8HDp7CRRfDKILcnobSm69NsEeC837yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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