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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5d3b09de024188509528b4cc1d1e774ec783acb0627dd113a911f55607f786' 
  AND token = '6DCS/RE5naHffmhRekkh85Z2UUlaBgZT5Mf9iEVR9LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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