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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d1fa3ebcb017de693e215fc58f6058a332336c4ad1f4f2bdd50566d51c26ab' 
  AND token = 'nLlqr3hmPGf3lhvUkmF6OQvLm+q5mH77RVl7bKpXXNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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