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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd580756a33164e7fba97d56c82d8c8a1fdab29207ba07e51bd60b78631cd05' 
  AND token = 'NHh7d9//2AKeP36nYoaOZdbi3Wsz/QlRKVpQcele6VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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