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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfc712795e0fba43a3ef2c4c997e9d6fb0c3cba74c9ecbd480662167eda6b34' 
  AND token = '+NZXxLgBDZUXEmyAtDkUJqyzymVybsguaOFL0d0438c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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