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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c772caf8d710fe8318e5ba309b56079b70232d6c88b9382cc6bacfc6723fddd' 
  AND token = 'R20AwcxTRFCWVH6mnq1z8v1+XnLYYARNJtTwwKYobx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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