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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94adb826a9fa9e76c9499e05cf352b109e81c03b66ec9f9923071978b7b06fb1' 
  AND token = 'E4fXfZ+O5n+Lmxlusvb5wI7q0yX1IGdv5NpZyAFDHHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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